A Study on the Aseismic Design of Near-Fault Structures Using Rocking-type Isolation Systems
碩士 === 國立交通大學 === 土木工程系所 === 92 === In this study, the feasibility of utilizing rocking-type isolation systems for near-fault earthquake protection of structures is explored. With a discontinuous interface between the base and the underlying foundation, the rocking system is allowed to rock intermit...
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| Format: | Others |
| Language: | zh-TW |
| Online Access: | http://ndltd.ncl.edu.tw/handle/72360549119557349797 |
| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 92 === In this study, the feasibility of utilizing rocking-type isolation systems for near-fault earthquake protection of structures is explored. With a discontinuous interface between the base and the underlying foundation, the rocking system is allowed to rock intermittently as the seismic overturning moment exceeds the restoring moment contributed by gravity. The rocking isolation then releases the resisting overturning moment while counteracts the earthquake load with the rotational inertia with respect to the supporting base, thus preventing the columns from yielding. Analytical modeling of this nonlinear dynamic system is derived and a numerical procedure developed based on the fourth-order Runge-Kutta-Nyström method. It is shown that the stability of rocking isolation depends on the pulse duration and amplitude of the near-fault earthquake via numerical simulations. It has been confirmed that stability and effectiveness in dynamic response alleviation of the rocking type isolation systems under near-fault earthquakes can be enhanced by the introduction of viscous fluid damper. The rocking mechanism integrated with energy dissipative dampers for up-lift control has been demonstrated to be a feasible and promising alternative of seismic isolation.
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